Spark-indicator.



L. E. TAIT.

SPARK INDICATOR.

APPLICATION FILED MAR. 14. 1911.

Patented Jan. 16, 1912.

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" concern:

"hot if, LAROY E. TAU, 2i citi Liiixed Ftaes, anti ii resideniof I inthe county of Weheion enci State of Nebraska, have invenied a new andImproved Spark-Indicator, of which the following is foii, ole-air, andorifice deecrip T invention eietes to e (ievioe adapted r1; of aneieciiio oii'oiiifi' and more "y relates co the need in con- I! sparkplug, whereby a spark named in the secondary circuit IioiLiGT toieitniine -l the circuit attach so. to em? 31mg, and which tT'figililand,

hv the current he operative eiiisin ing iiho con1 pi l oireini, wneeessnie nng their re- .ier obj-eniis to enable the operator to ieed iI 1BiZ 21hl1RG the necessity of retire ing the ignition 'WliLilOllilremoving; any part the eonionstion oheinoer or liS opponof my inventionis to hearing" metaiiic 'oonteeihe- I' e eieoiric eironii, enoi nenfitorci e and simple byeeiiing the circuit;

- and other objects in View oily hereinafter appear, the do?! i pro vi oeonsi; 1" certain no'vei struoiion ei'iengenient of i hereineiiei fn ivdescribed, illustrated e accompanying; drawings, and more per; onionointed out in ihe appended iii-aims.

E5016 C-nee is to he had to the eoooinpanv- .ing iiiemings, forming apart of ibis speciiicaiion, in which siniiizii' oosreeiei of i'e sisectional View L of my spark in- L'iiCiii'Ql llhufiile ping shown inelevation; and ilensvei'se seeiionni View hike epplioetion fileiiEaiarch M, 1911. No. (514,318

my improved form of spzii'h indioofiior which comprises an eie:terminai' 7, one end of which terminaies in a semi-oyiindric211 yoke 8having inroads 9 upon its inner surface ii'hioh threads are adapted toengage the threads on the ping 47-. The end of the feminine 1? oppositethe yoke is screwihi'eaded, as shown oi: 1 which threaded portioncarries a not 1.1! and a binding nut 12, between which held ineieiiioenci oi the iend 14 oi? the economy circuit. ierinediefe the not 11 andthe yoke 8 is an insulating sleeve 15 enoirciing the terminal 7 andhoving the end facing the poke i owed out to form a recess 16.Positioned W thin this recess 16 is coil spring17 one end oi which bearsupon the sleeve 15 moi the other end of which hours upon he yoke 8.,thereby tending to form :1 tension between these members for 'e purposeheieinzifioi' ciescI-i'oeci.

Enclosing two opposite i 1 of the sleeve 15 is e suhetanai i;{gown-shaped frame "18 having a closed enrved outer end 1% From thecurved. portion 1'9 the frame extends outward, Withits two parallelsides 20 embracing the sleeve 1.5, and liming two oppositeiymiispoeedinterned ends 21 embracing the outer end of said sleeve. Positionedbetween the ends of the sleeve 15 enii frame 18 and the nut 11 on theterm -i,

some distance toward iihe ping surrounds :1 partof the side of. theframe 18. It will be seen that this on}; 22 affords e means for graspingthe terminal 1121GT, at the some time insulates the terminal from. thehanri and affords a carrying means for the frame and er .iinai.

i will be seen that in order to piece the ndioaioion the spark plug, itis merely necessary to hook the end 19 of the frame over the end the 2;.iongituriiimliy away from the plug; an opening will he formed heiweenthe inner sieie of the end 19 and the yoke 8 into which plug may beinserted ing the hold on the cap 22,

the spring 1? will this sorei'v-threedeci portion may be pinned a hollowcap 22 which eiziieniie forwerri Then by releas plug, and by pulling thecap Iorce the yoke 8 into engagementwith the v plug, thereby firmlyholding the indicator in place.

Should it be desired to determine whether there is sufficient current inthe secondary to generate a spark, the cap 22' is drawn in the directionaway from the plug, which action will form a spark gap between thethreads 6 on the plug 4 and the threads 10 on the yoke 8, therebyaffording a ready, quick and accurate means for determining thecondition of a current in the secondary. As this entire device isoutside of the combustion chamber, said chamber is in no way interferedwith during the testing of the sparking circuit, nor is it necessary inany way to interfere with, change or break the secondary circuit.

Many changes could bemade in the above constructirm and many apparentlywidely different embodiments of this invention could 'be made withoutdeparting from the scope thereof. It is intended that all matterscontained herein in the above description, or shown in the accompanyingdrawings, 'shall be interpreted as illustrative and not in a limitingsense. It is also to be understood that the language used in thefollowing claims is merely intended to cover all the generic andspecific features of the invention herein described and all statementsof the scope of the invention, which, as a matter of language, might besaid to fall therebetween, and that materials, sizes and relativities ofparts are non-essential, except as called for in, the claims.

Having thus described my invention, 1 claim as new and desire to secureby Letters Patent:

1. In a spark indicator, comprising an electric terminal having a yokeend adapted to engage one side of a combustion engine spark plug, aninsulating cap surrounding said terminal adjacent the yoke end aframepositioned within said cap and inclosing and spaced apart from said yokeend, a sleeve insulating said terminal from said end, and a springwithin said sleeve bearing on the same and on the yoke end forcing saidyoke and frame together, to hold the spark plug between the same.

2. In a spark indicator, a hollow sleeve, a frame having a closed curvedouter end, the inner end of which engages said sleeve, a terminalprojecting through said sleeve and having a yoke coacting with thecurved end of the frame to hold a spark plug therebetween, a spring insaid sleeve maintaining said yoke and frame resiliently in contact withthe plug, and means insulated. from said frame, by means of which saidyoke may bewithdrawn from said plug, to form a spark space between saidyoke and plug.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

LAROY E. TAIT.

Witnesses W. S. ORTON, J. P. DAVIS.

